An honest guide
DIY plaster repairs: when to fix it yourself
You can safely DIY: nail holes, picture-hook holes, hairline cracks and holes smaller than a 50c piece on walls at eye level. Call a plasterer for: anything on a ceiling, cracks that keep returning, texture matching, water stains, cornice damage, or holes bigger than your palm.
Patch it yourself if it’s…
- Nail and picture-hook holes — fill, sand, spot-prime
- Hairline cracks narrower than a 20c coin, walls only
- Small holes up to a 50c piece, at eye level, smooth surfaces
- Fill-and-paint touch-ups between tenancies
Call us if it’s…
- Anything on a ceiling — gravity and raking light expose everything
- Cracks that have returned after a previous fill — the house is moving
- Texture matching — stipple and orbital finishes rarely blend invisibly
- Water-stained plaster — the stain bleeds back through paint until sealed
- Cornice mitres and profiles — re-setting is the fix, filling is cosmetic
- Holes bigger than your palm — structural backing needed behind the patch
If you do it yourself
The kit & the three fixes
The kit
- Ready-mixed joint compound — a small tub beats a big tub that dries out
- Self-adhesive mesh patch for holes, paper tape for cracks
- A 100mm flexible knife — wider isn't better for small work
- 120-grit then 180-grit sandpaper, wrapped on a flat block
- Spot primer — patching compound sucks paint in differently to the wall
01
Nail holes
Squeeze compound in, scrape it flat with the knife, let it dry, sand with 180-grit, spot-prime. Two minutes each, and they're gone forever.
02
Hairline cracks
The mistake is filling bare. Scrape the crack open slightly, bed in paper tape over compound, then coat twice, sanding between. Taped, it holds; filled bare, it returns.
03
Small holes
Stick a mesh patch over the hole, coat compound across it, feather wider than feels necessary, twice. Sand under a raking light before priming — if you can see the edge, another skim coat fixes it.
The trade truth
Here's the trade truth: your patch will look perfect at noon and show at 5pm when the sun rakes the wall. If a repair is in a sightline, at height, or in a room that matters, the difference between DIY and professional is exactly the width of the feathering — and that's hours of craft, not a better product from the shelf.
DIY questions
FAQs
Thin skim coats dry in a few hours; deeper fills and full patches need a day or more per coat in Brisbane humidity. If the compound has changed from pink to white it's dry — sand before the next coat, and never paint onto compound that still feels cool to the touch.
Explore